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The nature of polyamorphism and amorphous-to-amorphous transitions is investigated by means of an exactly solvable model with quenched disorder, the spherical $s+p$ multispin interaction model. The analysis is carried out in the framework of replica symmetry breaking theory and leads to the identification of low-temperature glass phases of different kinds. Besides the usual one-step solution, known to reproduce all basic properties of structural glasses, also a physically consistent two-step solution arises. More complicated phases are found as well, as temperature is further decreased, expressing a complex variety of metastable-state structures for amorphous systems.
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Crisanti et al. (2007) studied this question.
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